NDLI: Differential Instant Radiosity for mixed reality

Content Provider	IEEE Xplore Digital Library
Author	Knecht, M. Traxler, C. Mattausch, O. Purgathofer, W. Wimmer, M.
Copyright Year	2010
Description	Author affiliation: Institute of Computer Graphics and Algorithms, Vienna University of Technology, Austria (Knecht, M.; Traxler, C.; Mattausch, O.; Purgathofer, W.; Wimmer, M.)
Abstract	In this paper we present a novel plausible realistic rendering method for mixed reality systems, which is useful for many real life application scenarios, like architecture, product visualization or edutainment. To allow virtual objects to seamlessly blend into the real environment, the real lighting conditions and the mutual illumination effects between real and virtual objects must be considered, while maintaining interactive frame rates (20–30fps). The most important such effects are indirect illumination and shadows cast between real and virtual objects. Our approach combines Instant Radiosity and Differential Rendering. In contrast to some previous solutions, we only need to render the scene once in order to find the mutual effects of virtual and real scenes. The dynamic real illumination is derived from the image stream of a fish-eye lens camera. We describe a new method to assign virtual point lights to multiple primary light sources, which can be real or virtual. We use imperfect shadow maps for calculating illumination from virtual point lights and have significantly improved their accuracy by taking the surface normal of a shadow caster into account. Temporal coherence is exploited to reduce flickering artifacts. Our results show that the presented method highly improves the illusion in mixed reality applications and significantly diminishes the artificial look of virtual objects superimposed onto real scenes.
Starting Page	99
Ending Page	107
File Size	19404287
Page Count	9
File Format	PDF
ISBN	9781424493432
e-ISBN	9781424493463
e-ISBN	9781424493456
DOI	10.1109/ISMAR.2010.5643556
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-10-13
Publisher Place	Korea (South)
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Lighting Light sources Rendering (computer graphics) Virtual reality Real time systems Cameras Shadow mapping Instant Radiosity Mixed Reality Real-time Global Illumination Differential Rendering
Content Type	Text
Resource Type	Article

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